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A cold store designed only for the product cooling load repeatedly fails to hold temperature.

What has most likely been omitted?

  • A.The store's floor area
  • B.The produce's arrival temperature
  • C.The other three load terms
  • D.The specific heat of the produce

Answer: C

Correct answer: The other three load terms

Designing on the product cooling load alone omits the respiration, transmission and infiltration loads. The product load is large but transient - it ends once the produce reaches temperature - whereas the other three run continuously, so a plant sized on the product load alone can pull down but cannot hold.

For 40 tonnes of respiring produce those continuous terms might total \( 1.8 + 1.4 + 2.6 = 5.8 \) kW, plus internal loads from lights and fans. The arrival temperature and specific heat are inputs to the product load itself and would have been used already.

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